The Echinoid Directory

Pygmaeocidaris Doderlein, 1905, p. 621

Diagnostic Features
  • Test small (less than 15 mm diameter), tall and subconical, oral side flattened.
  • Apical disc very large, dicyclic; genital plates pentagonal, ocular plates projecting and subtrigonal. Periproct opening small and central, circular, with five anal valve plates. No gonopores open in known specimens.
  • Ambulacra trigeminate, with small oblique pore-pairs; weak phyllode developed on lowest two compound plates.
  • Ambulacral plating arbaciid, with single large central element and two small demiplates.
  • Interambulacral plates wide; primibasal plate present and prolonged with primary tubercle.
  • Aboral plates without primary tubercles; covered in fine granulation and a few, small, irregularly scattered, rounded pustules.
  • On oral surface one primary tubercle on ambulacral plates and two on interambulacral plates forming oblique series. No tubercles on apical side.
  • Peristome about half test diameter.
  • Single sphaeridium in perradial pit.
  • Spines rather short, flattened, distally serrated.
Recent, Indian Ocean.
Name gender feminine
Podocidaris prionigera Agassiz, 1879, p. 199, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Arbacioida, Arbaciidae.



Like Codiopsis but distinguished from that genus by having small undifferentiated aboral pore-pairs rather than large subconjugate pore-pairs. Differs from Habrocidaris in having short but distinct phyllodes adorally, and compound plating that continues to the peristome margin.

Döderlein, L. 1905. Über die Seeigel aus der Deutschen Tiefsee-Expedition. Zoologischer Anzeiger, 28, 621-624.

Mortensen, T. 1935. A monograph of the Echinoidea II. Bothriocidaroida, Melonechinoida, Lepidocentroida and Stirodonta. C. A. Reitzel, Copenhagen